@model string
<div>
    @{
        var hash = Home.Site.Helpers.GravatarHelper.HashEmailForGravatar(Model);
        var url = hash == null ? Url.Content("~/Content/images/anonim.jpg") : string.Format("http://www.gravatar.com/avatar/{0}", hash);
    }
    <a href="//ru.gravatar.com/">
        <img src="@url" class="img-rounded" width="80" height="80" alt=""/>
    </a>
</div>
